Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
SI9130 Datasheet(PDF) 10 Page - Vishay Siliconix |
|
SI9130 Datasheet(HTML) 10 Page - Vishay Siliconix |
10 / 15 page www.vishay.com 10 Document Number: 70190 S11-0975-Rev. G, 16-May-11 Vishay Siliconix Si9130 This document is subject to change without notice. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 3.3 V and 5 V Switching Controllers Each PWM controller on the Si9130 is identical with the exception of the preset output voltages. The controllers only share three functional blocks (see Figure 3): the oscillator, the voltage reference (REF) and the 5 V logic supply (VL). The 3.3 V and 5 V controllers are independently enabled with pins ON3 and ON5, respectively. The PWMs are a direct- summing type, without the typical integrating error amplifier along with the phase shift which is a side effect of this type of topology. Feedback compensation is not needed, as long as the output capacitance and its ESR requirements are met, according to the Design Considerations section of this data sheet. The main PWM comparator is an open loop device which is comprised of three comparators summing four signals: the feedback voltage error signal, current sense signal, slope- compensation ramp and voltage reference as shown in Figure 3. This method of control comes closer to the ideal of maintaining the output voltage on a cycle-by-cycle basis. When the load demands high current levels, the controller is in full PWM mode. Every cycle from the oscillator asserts the output latch and drives the gate of the high-side MOSFET for a period determined by the duty cycle (approximately VOUT/VIN x 100 %) and the frequency. The high-side switch turns off, setting the synchronous rectifier latch and 60 ns later, the rectifier MOSFET turns on. The low-side switch stays on until the start of the next clock Figure 3. Si9130 Controller Block Diagram 60 kHz LPF CS_ OSC 1X R S Q R S Q Level Shift Level Shift Shoot- Through Control FB_ BST_ DH_ LX_ VL DL_ PGND Current Limit 0 mV to 100 mV Synchronous Rectifier Control 1R 30R VL 4 µA 3.3 V Minimum Current (Pulse-Skipping Mode) 25 mV REF, 3.3 V (or Internal 5 V Reference) SS_ ON_ Summing Comparator Slope Comp |
Número de pieza similar - SI9130_11 |
|
Descripción similar - SI9130_11 |
|
|
Enlace URL |
Política de Privacidad |
ALLDATASHEET.ES |
¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |